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- Title
Sedimentary deformation structures in the Nyixoi Chongco rock avalanche: implications on rock avalanche transport mechanisms.
- Authors
Wang, Yu-Feng; Cheng, Qian-Gong; Shi, An-Wen; Yuan, Yun-Qiang; Yin, Bang-Min; Qiu, Yu-Heng
- Abstract
To learn the transport kinematics of rock avalanches, an outcrop study of the Nyixoi Chongco rock avalanche in the Yadong-Gulu Rift of the south Tibetan Plateau, China, is presented here. Sedimentological analysis associated with the outcrops allows important considerations of rock avalanche transport mechanisms. From the outcrops, a series of plastic-brittle deformations in the substrate, including diapiric structures, convoluted laminations, faults, and basal décollements, were observed, indicating the occurrence of a bulldozing effect between the avalanche mass and substrate. In addition, jigsaw structures, inner shear zones, and aligned clasts were found in the avalanche deposit, indicating the occurrence of a shear-dominated movement with differential internal stresses and limited disturbances. Therefore, this paper proposes that a simple shear process dominated the transport of the Nyixoi Chongco rock avalanche and contributed to the generation of these sedimentary structures. A lack of liquefied sandy structures in the outcrops indicates that liquefaction was not a key factor causing the hypermobility of the rock avalanche.
- Subjects
CHINA; PLATEAUS; SEDIMENTARY structures; AVALANCHES
- Publication
Landslides, 2019, Vol 16, Issue 3, p523
- ISSN
1612-510X
- Publication type
Article
- DOI
10.1007/s10346-018-1117-7